[ChuckS]

If it’s a new Alpine that issue should be covered 7nder warranty work from Keystone.. I own an Alpine.. more or less the same as a Montana..

Emergency brake wire harness is visible at back side of pin box.. there is a metal junction box there...wiring runs from there down inside the the front cargo bay compartment...

DC wire to battery from break away switch runs thru same area...

And if you had been towing with all four brakes engaged I’m just certain you would have smelled something.. you would have noticed the wheel hubs and tires wa6 hotter than normal.

And if they where engaged then I’d be replacing everything on both axles related to brakes, bearings, etc...